1. Regarding the resolution, in fact, no matter what the manufacturer says, the domestic testing machine can definitely meet the requirements of 1 class testing machine. The resolution is too high just for the sake of popularization, which has no practical significance. If you have to say which of the two resolutions you mentioned is better, you can only say that the maximum test force of 1/5000 is better;
2. The second question and the third question are related. Generally, DC servo motor is used, and the moving speed of the cross beam of the testing machine is 1-300mm/min. Using AC servo motor, the speed of testing machine can reach 0.05-500 mm/min; So, of course, the latter is better. AC servo motors are generally imported motors with high speed accuracy; But the price of the latter tester is also higher;
According to your first three questions, the testing machine you choose should be an electronic tensile testing machine or an electronic universal testing machine, so there is no chain drive, and it should all be synchronous belt drive. Synchronous belt drive is relatively stable, good synchronization, fast speed and low noise.
Haha, as for which tester you choose, I can't say anything.